Optical-head apparatus

Abstract

The invention proposes an optical head device, in which the accurate positioning for optical components is allowed by using a frame body consisting of a photosensitive glass mounted on a base. In the optical head device 1, the frame body 7 consisting of the U-shaped photosensitive glass is mounted on the base 3 having the constitution laminated with a metallic wiring substrate 31 and a metallic base frame 32, and a light receiving / emitting element 4, 1st and 2nd optical elements 61, 62 and a collimator lens 63 are positioned with this frame body 7. For the optical elements 61, 62, 63 held by the frame body 7, the fine adjustment for the mounting position is allowed from the rear side of an opening part through this opening part opened on the base 3. Consequently, the accurate positioning is attained for each optical element by the simple work.

Description

technical field [0001] The present invention relates to an optical head device for recording and reproducing optical recording media such as CD and DVD. Specifically, it relates to the positioning structure of the light source, light receiving element and various optical elements in the optical head device. Background technique [0002] An optical head device for recording and reproducing optical recording media such as CDs and DVDs includes a semiconductor laser as a laser light source, and a photodetector for receiving light emitted from the semiconductor laser and reflected light reflected by the optical recording medium. Various optical elements such as lenses for guiding outgoing light or reflected light between these semiconductor lasers and photodetectors, and objective lenses for focusing outgoing light guided by the optical elements on an optical recording medium. These parts are mounted on a frame made of a metal material such as aluminum or a material such as res...

AI Technical Summary

Problems solved by technology

For this reason, the machining accuracy (mold accuracy) of the reference surface of the frame must also be high-precision, so a lot of labor is required to manufacture the metal mold of the frame.

Especially when multiple molds are required, since the precision of these molds must be consistent, there is a problem that the manufacturing cost of metal molds is very high

[0004] When a frame made of resin is used, the position of the optical element mounted on the frame will fluctuate more than that of a metal frame due to resin expansion caused by temperature difference, which will reduce the reliability of the device.

In addition, since the sealing performance of the resin frame due to the adhesive is lower than that of the metal frame, it is necessary to add a process of roughening the bonding surface.

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